Re: ISP's who where affected by the misconfiguration: start using IRR and checking your BGP updates

> I've only dealt with a handful of the bigger networks,
but every transit 
> BGP session I've ever been the customer role on has
been filtered by the 
> provider.  From memory and in no particular order,
that's UUNet, Level3, 
> Digex, Intermedia, Global Crossing, Genuity, Sprint,
Above.net, Time 
> Warner, C&W, MCI, XO, Broadwing, and a few smaller
ones nobody's likely to 
> have heard of.

There's at least one reasonably big transit provider that
does *not*
do prefix filtering: TeliaSonera (AS 1299). They *do*
perform as-path
filtering, but the effectiveness is disputable...

> As an ISP providing transit, all of our customers get
prefix-filtered.

Same here.

Steinar Haug, Nethelp consulting, sthaugnethelp.no

On Feb 25, 2008, at 11:40 AM, sthaugnethelp.no wrote:
>> I've only dealt with a handful of the bigger
networks, but every  
>> transit
>> BGP session I've ever been the customer role on has
been filtered  
>> by the
>> provider.  From memory and in no particular order,
that's UUNet,  
>> Level3,
>> Digex, Intermedia, Global Crossing, Genuity,
Sprint, Above.net, Time
>> Warner, C&W, MCI, XO, Broadwing, and a few
smaller ones nobody's  
>> likely to
>> have heard of.
>
> There's at least one reasonably big transit provider
that does *not*
> do prefix filtering: TeliaSonera (AS 1299). They *do*
perform as-path
> filtering, but the effectiveness is disputable...

No, the effectiveness is not disputable.  It is guaranteed
to be sub- 
optimal.  This is not in doubt or question.

See, as has been quoted many times, as7007.

-- 
TTFN,
patrick